Revert "Reland "[Read aloud] Handle preprocessing tests for TS segmentation.""

This reverts commit c89b34c26ded14d2c653f065184c1776f475009a.

Reason for revert: Step "browser_tests (retry shards) on Mac-13" failing
on builder "chromium/ci/Mac13 Tests"

List of failed builders:

Builder: Mac13 Tests
https://ci.chromium.org/p/chromium/builders/ci/Mac13%20Tests First
failing build:
https://ci.chromium.org/p/chromium/builders/ci/Mac13%20Tests/b8700982211050593953
Step "network_service_web_request_proxy_browser_tests (retry shards) on
Ubuntu-22.04" failing on builder "chromium/ci/Network Service Linux"

List of failed builders:

Builder: Network Service Linux
https://ci.chromium.org/p/chromium/builders/ci/Network%20Service%20Linux
First failing build:
https://ci.chromium.org/p/chromium/builders/ci/Network%20Service%20Linux/b8700986080706764081
Step "bf_cache_browser_tests (retry shards) on Ubuntu-22.04" failing on
builder "chromium/ci/linux-bfcache-rel"

List of failed builders:

Builder: linux-bfcache-rel
https://ci.chromium.org/p/chromium/builders/ci/linux-bfcache-rel First
failing build:
https://ci.chromium.org/p/chromium/builders/ci/linux-bfcache-rel/b8700984079557340417
Step "browser_tests (retry shards) on Ubuntu-22.04" failing on builder
"chromium/ci/linux-wayland-weston-rel-tests"

List of failed builders:

Builder: linux-wayland-weston-rel-tests
https://ci.chromium.org/p/chromium/builders/ci/linux-wayland-weston-rel-tests
First failing build:
https://ci.chromium.org/p/chromium/builders/ci/linux-wayland-weston-rel-tests/b8700985719377747569
Step "browser_tests (retry shards) on Mac-15" failing on builder
"chromium/ci/mac15-x64-rel-tests"

List of failed builders:

Builder: mac15-x64-rel-tests
https://ci.chromium.org/p/chromium/builders/ci/mac15-x64-rel-tests First
failing build:
https://ci.chromium.org/p/chromium/builders/ci/mac15-x64-rel-tests/b8700982492667672449

Original change's description:
> Reland "[Read aloud] Handle preprocessing tests for TS segmentation."
>
> This is a reland of commit 7d3788e4c720a3359bf4e9ac1a37cef7fb261171
>
> Resetting the read aloud model in speech_test should fix the
> flaky tests.
>
> Original change's description:
> > [Read aloud] Handle preprocessing tests for TS segmentation.
> >
> > This change:
> > - Moves the preprocessing tests in ReadAnythingAppController into the
> > V8 test class
> > - Adds a logically equivalent missing test for the TS segmentation
> > test
> > - Fixes bug where isInitialized_ wasn't checked before re-initializing
> >   with the TS segmentation model
> >
> >
> > Bug: 440400392
> > Change-Id: Icbca371967d9a45bacffac1ce4d71d11cf039f4f
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7038891
> > Commit-Queue: Lauren Winston <lwinston@google.com>
> > Reviewed-by: Kristi Saney <kristislee@google.com>
> > Cr-Commit-Position: refs/heads/main@{#1529221}
>
> Bug: 440400392
> Change-Id: Id8491a546dd11e195e4703e910ae9dc73b084116
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7040788
> Reviewed-by: Kristi Saney <kristislee@google.com>
> Commit-Queue: Lauren Winston <lwinston@google.com>
> Cr-Commit-Position: refs/heads/main@{#1529882}

Bug: 440400392
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Change-Id: I5851079fde61a45c47d55888c6b332c807e49b63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7043483
Auto-Submit: Mikihito Matsuura <mikt@google.com>
Owners-Override: Mikihito Matsuura <mikt@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1529924}